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لينك تحميل الملزمة
https://drive.google.com/file/d/1BwqxkAptz0KCkhKAOp5SsOR8toaAcfkJ/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This Video :
- The atoms of noble elements are the most stable Atoms due to the completeness of their outermost energy level with electrons.
- The atoms of other elements tend to enter in chemical reactions to reach the stable state to become their outermost energy levels completed with electrons by:
• Losing the outermost electrons as in metals.
• Gaining or sharing with electrons as in nonmetals.
- This number of electrons is known as "Valency".

Valency
It is the number of electrons that an atom gains, loses or even shares during a chemical reaction.

The valency of an element is determined according to the number of electrons in the outermost energy level of its atom as in the following table :

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